The speakers PQ SPA24 are specifically designed to be installed in humid places, or directly in contact with water. Due to their own features, they are employed in: - SPAs -swimming pools - turkish baths. They are also manufactured with special materials resistant to anti-UV treatment and to salt, for instance on boats or in pools filled with sea water. Main technical features: - external diameter 3.4'' - full-range 160Hz - 20kHz - impedance 4ohm - max power 15W RMS.